1 /* $NetBSD: icmp6.c,v 1.258 2024/07/05 04:31:54 rin Exp $ */ 2 /* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.258 2024/07/05 04:31:54 rin Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_compat_netbsd.h" 69 #include "opt_inet.h" 70 #include "opt_ipsec.h" 71 #endif 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/kmem.h> 76 #include <sys/mbuf.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/time.h> 81 #include <sys/kernel.h> 82 #include <sys/syslog.h> 83 #include <sys/domain.h> 84 #include <sys/sysctl.h> 85 86 #include <net/if.h> 87 #include <net/route.h> 88 #include <net/if_dl.h> 89 #include <net/if_types.h> 90 #include <net/nd.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_pcb.h> 94 #include <netinet/in_var.h> 95 #include <netinet/ip6.h> 96 #include <netinet/wqinput.h> 97 #include <netinet6/ip6_var.h> 98 #include <netinet6/ip6_private.h> 99 #include <netinet/icmp6.h> 100 #include <netinet6/icmp6_private.h> 101 #include <netinet6/mld6_var.h> 102 #include <netinet6/in6_pcb.h> 103 #include <netinet6/in6_ifattach.h> 104 #include <netinet6/ip6protosw.h> 105 #include <netinet6/nd6.h> 106 #include <netinet6/scope6_var.h> 107 108 #ifdef IPSEC 109 #include <netipsec/ipsec.h> 110 #include <netipsec/ipsec6.h> 111 #include <netipsec/key.h> 112 #endif 113 114 #include "faith.h" 115 #if defined(NFAITH) && 0 < NFAITH 116 #include <net/if_faith.h> 117 #endif 118 119 /* Ensure that non packed structures are the desired size. */ 120 __CTASSERT(sizeof(struct icmp6_hdr) == 8); 121 __CTASSERT(sizeof(struct icmp6_nodeinfo) == 16); 122 __CTASSERT(sizeof(struct icmp6_namelookup) == 20); 123 __CTASSERT(sizeof(struct icmp6_router_renum) == 16); 124 125 __CTASSERT(sizeof(struct nd_router_solicit) == 8); 126 __CTASSERT(sizeof(struct nd_router_advert) == 16); 127 __CTASSERT(sizeof(struct nd_neighbor_solicit) == 24); 128 __CTASSERT(sizeof(struct nd_neighbor_advert) == 24); 129 __CTASSERT(sizeof(struct nd_redirect) == 40); 130 __CTASSERT(sizeof(struct nd_opt_hdr) == 2); 131 __CTASSERT(sizeof(struct nd_opt_route_info) == 8); 132 __CTASSERT(sizeof(struct nd_opt_prefix_info) == 32); 133 __CTASSERT(sizeof(struct nd_opt_rd_hdr) == 8); 134 __CTASSERT(sizeof(struct nd_opt_mtu) == 8); 135 __CTASSERT(sizeof(struct nd_opt_nonce) == 2 + ND_OPT_NONCE_LEN); 136 __CTASSERT(sizeof(struct nd_opt_rdnss) == 8); 137 __CTASSERT(sizeof(struct nd_opt_dnssl) == 8); 138 139 __CTASSERT(sizeof(struct mld_hdr) == 24); 140 __CTASSERT(sizeof(struct ni_reply_fqdn) == 8); 141 __CTASSERT(sizeof(struct rr_pco_match) == 24); 142 __CTASSERT(sizeof(struct rr_pco_use) == 32); 143 __CTASSERT(sizeof(struct rr_result) == 24); 144 145 extern struct domain inet6domain; 146 147 percpu_t *icmp6stat_percpu; 148 149 extern struct inpcbtable raw6cbtable; 150 extern int icmp6errppslim; 151 static int icmp6errpps_count = 0; 152 static struct timeval icmp6errppslim_last; 153 extern int icmp6_nodeinfo; 154 155 bool icmp6_dynamic_rt_msg = false; 156 157 /* 158 * List of callbacks to notify when Path MTU changes are made. 159 */ 160 struct icmp6_mtudisc_callback { 161 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 162 void (*mc_func)(struct in6_addr *); 163 }; 164 165 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 166 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 167 168 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 169 extern int pmtu_expire; 170 171 /* XXX do these values make any sense? */ 172 static int icmp6_mtudisc_hiwat = 1280; 173 static int icmp6_mtudisc_lowat = 256; 174 175 /* 176 * keep track of # of redirect routes. 177 */ 178 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 179 180 /* XXX experimental, turned off */ 181 static int icmp6_redirect_hiwat = -1; 182 static int icmp6_redirect_lowat = -1; 183 184 /* Protect mtudisc and redirect stuffs */ 185 static kmutex_t icmp6_mtx __cacheline_aligned; 186 187 static bool icmp6_reflect_pmtu = false; 188 189 static void icmp6_errcount(u_int, int, int); 190 static int icmp6_rip6_input(struct mbuf **, int); 191 static void icmp6_reflect(struct mbuf *, size_t); 192 static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 193 static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *, 194 struct in6_addr *, struct in6_addr *); 195 static void icmp6_redirect_input(struct mbuf *, int); 196 static struct mbuf *ni6_input(struct mbuf *, int); 197 static struct mbuf *ni6_nametodns(const char *, int, int); 198 static int ni6_dnsmatch(const char *, int, const char *, int); 199 static int ni6_addrs(struct icmp6_nodeinfo *, struct ifnet **, char *, 200 struct psref *); 201 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 202 struct ifnet *, int); 203 static int icmp6_notify_error(struct mbuf *, int, int, int); 204 static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 205 static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 206 static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 207 static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 208 209 /* workqueue-based pr_input */ 210 static struct wqinput *icmp6_wqinput; 211 static void _icmp6_input(struct mbuf *m, int off, int proto); 212 213 void 214 icmp6_init(void) 215 { 216 217 sysctl_net_inet6_icmp6_setup(NULL); 218 mld_init(); 219 220 mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE); 221 mutex_enter(&icmp6_mtx); 222 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 223 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 224 mutex_exit(&icmp6_mtx); 225 226 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 227 228 icmp6_wqinput = wqinput_create("icmp6", _icmp6_input); 229 } 230 231 static void 232 icmp6_errcount(u_int base, int type, int code) 233 { 234 switch (type) { 235 case ICMP6_DST_UNREACH: 236 switch (code) { 237 case ICMP6_DST_UNREACH_NOROUTE: 238 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 239 return; 240 case ICMP6_DST_UNREACH_ADMIN: 241 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 242 return; 243 case ICMP6_DST_UNREACH_BEYONDSCOPE: 244 ICMP6_STATINC(base + 245 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 246 return; 247 case ICMP6_DST_UNREACH_ADDR: 248 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 249 return; 250 case ICMP6_DST_UNREACH_NOPORT: 251 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 252 return; 253 } 254 break; 255 case ICMP6_PACKET_TOO_BIG: 256 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 257 return; 258 case ICMP6_TIME_EXCEEDED: 259 switch (code) { 260 case ICMP6_TIME_EXCEED_TRANSIT: 261 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 262 return; 263 case ICMP6_TIME_EXCEED_REASSEMBLY: 264 ICMP6_STATINC(base + 265 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 266 return; 267 } 268 break; 269 case ICMP6_PARAM_PROB: 270 switch (code) { 271 case ICMP6_PARAMPROB_HEADER: 272 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 273 return; 274 case ICMP6_PARAMPROB_NEXTHEADER: 275 ICMP6_STATINC(base + 276 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 277 return; 278 case ICMP6_PARAMPROB_OPTION: 279 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 280 return; 281 } 282 break; 283 case ND_REDIRECT: 284 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 285 return; 286 } 287 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 288 } 289 290 /* 291 * Register a Path MTU Discovery callback. 292 */ 293 void 294 icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 295 { 296 struct icmp6_mtudisc_callback *mc, *new; 297 298 new = kmem_alloc(sizeof(*mc), KM_SLEEP); 299 300 mutex_enter(&icmp6_mtx); 301 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 302 mc = LIST_NEXT(mc, mc_list)) { 303 if (mc->mc_func == func) { 304 mutex_exit(&icmp6_mtx); 305 kmem_free(new, sizeof(*mc)); 306 return; 307 } 308 } 309 310 new->mc_func = func; 311 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list); 312 mutex_exit(&icmp6_mtx); 313 } 314 315 /* 316 * A wrapper function for icmp6_error() necessary when the erroneous packet 317 * may not contain enough scope zone information. 318 */ 319 void 320 icmp6_error2(struct mbuf *m, int type, int code, int param, 321 struct ifnet *ifp, struct in6_addr *src) 322 { 323 struct ip6_hdr *ip6; 324 325 KASSERT(ifp != NULL); 326 327 if (m->m_len < sizeof(struct ip6_hdr)) { 328 m = m_pullup(m, sizeof(struct ip6_hdr)); 329 if (m == NULL) 330 return; 331 } 332 333 ip6 = mtod(m, struct ip6_hdr *); 334 335 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 336 goto out; 337 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 338 goto out; 339 340 *src = ip6->ip6_src; 341 icmp6_error(m, type, code, param); 342 return; 343 344 out: 345 m_freem(m); 346 } 347 348 /* 349 * Generate an error packet of type error in response to bad IP6 packet. 350 */ 351 void 352 icmp6_error(struct mbuf *m, int type, int code, int param) 353 { 354 struct ip6_hdr *oip6, *nip6; 355 struct icmp6_hdr *icmp6; 356 u_int preplen; 357 int off; 358 int nxt; 359 360 ICMP6_STATINC(ICMP6_STAT_ERROR); 361 362 /* count per-type-code statistics */ 363 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 364 365 if (m->m_flags & M_DECRYPTED) { 366 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 367 goto freeit; 368 } 369 370 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 371 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 372 return; 373 oip6 = mtod(m, struct ip6_hdr *); 374 375 /* 376 * If the destination address of the erroneous packet is a multicast 377 * address, or the packet was sent using link-layer multicast, 378 * we should basically suppress sending an error (RFC 2463, Section 379 * 2.4). 380 * We have two exceptions (the item e.2 in that section): 381 * - the Packet Too Big message can be sent for path MTU discovery. 382 * - the Parameter Problem Message that can be allowed an icmp6 error 383 * in the option type field. This check has been done in 384 * ip6_unknown_opt(), so we can just check the type and code. 385 */ 386 if ((m->m_flags & (M_BCAST|M_MCAST) || 387 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 388 (type != ICMP6_PACKET_TOO_BIG && 389 (type != ICMP6_PARAM_PROB || 390 code != ICMP6_PARAMPROB_OPTION))) 391 goto freeit; 392 393 /* 394 * RFC 2463, 2.4 (e.5): source address check. 395 * XXX: the case of anycast source? 396 */ 397 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 398 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 399 goto freeit; 400 401 /* 402 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 403 * don't do it. 404 */ 405 nxt = -1; 406 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 407 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 408 struct icmp6_hdr *icp; 409 410 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 411 sizeof(*icp)); 412 if (icp == NULL) { 413 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 414 return; 415 } 416 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 417 icp->icmp6_type == ND_REDIRECT) { 418 /* 419 * ICMPv6 error 420 * Special case: for redirect (which is 421 * informational) we must not send icmp6 error. 422 */ 423 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 424 goto freeit; 425 } else { 426 /* ICMPv6 informational - send the error */ 427 } 428 } else { 429 /* non-ICMPv6 - send the error */ 430 } 431 432 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 433 434 /* Finally, do rate limitation check. */ 435 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 436 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 437 goto freeit; 438 } 439 440 /* 441 * OK, ICMP6 can be generated. 442 */ 443 444 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 445 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 446 447 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 448 M_PREPEND(m, preplen, M_DONTWAIT); 449 if (m && M_UNWRITABLE(m, preplen)) 450 m = m_pullup(m, preplen); 451 if (m == NULL) { 452 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 453 return; 454 } 455 456 nip6 = mtod(m, struct ip6_hdr *); 457 nip6->ip6_src = oip6->ip6_src; 458 nip6->ip6_dst = oip6->ip6_dst; 459 460 in6_clearscope(&oip6->ip6_src); 461 in6_clearscope(&oip6->ip6_dst); 462 463 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 464 icmp6->icmp6_type = type; 465 icmp6->icmp6_code = code; 466 icmp6->icmp6_pptr = htonl((u_int32_t)param); 467 468 /* 469 * icmp6_reflect() is designed to be in the input path. 470 * icmp6_error() can be called from both input and output path, 471 * and if we are in output path rcvif could contain bogus value. 472 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 473 * information in ip header (nip6). 474 */ 475 m_reset_rcvif(m); 476 477 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 478 479 /* header order: IPv6 - ICMPv6 */ 480 icmp6_reflect(m, sizeof(struct ip6_hdr)); 481 482 return; 483 484 freeit: 485 /* 486 * If we can't tell whether or not we can generate ICMP6, free it. 487 */ 488 m_freem(m); 489 } 490 491 /* 492 * Process a received ICMP6 message. 493 */ 494 static void 495 _icmp6_input(struct mbuf *m, int off, int proto) 496 { 497 struct mbuf *n; 498 struct ip6_hdr *ip6, *nip6; 499 struct icmp6_hdr *icmp6, *nicmp6; 500 int icmp6len = m->m_pkthdr.len - off; 501 int code, sum; 502 struct ifnet *rcvif; 503 struct psref psref; 504 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN]; 505 506 rcvif = m_get_rcvif_psref(m, &psref); 507 if (__predict_false(rcvif == NULL)) 508 goto freeit; 509 510 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 511 KASSERT(ICMP6_MAXLEN < MCLBYTES); 512 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 513 514 /* 515 * Locate icmp6 structure in mbuf, and check 516 * that not corrupted and of at least minimum length 517 */ 518 519 if (icmp6len < sizeof(struct icmp6_hdr)) { 520 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 521 icmp6_ifstat_inc(rcvif, ifs6_in_error); 522 goto freeit; 523 } 524 525 if (m->m_len < sizeof(struct ip6_hdr)) { 526 m = m_pullup(m, sizeof(struct ip6_hdr)); 527 if (m == NULL) { 528 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 529 icmp6_ifstat_inc(rcvif, ifs6_in_error); 530 goto freeit; 531 } 532 } 533 534 ip6 = mtod(m, struct ip6_hdr *); 535 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 536 if (icmp6 == NULL) { 537 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 538 icmp6_ifstat_inc(rcvif, ifs6_in_error); 539 goto freeit; 540 } 541 542 /* 543 * Enforce alignment requirements that are violated in 544 * some cases, see kern/50766 for details. 545 */ 546 if (ACCESSIBLE_POINTER(icmp6, struct ip6_hdr) == 0) { 547 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 548 if (m == NULL) { 549 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 550 icmp6_ifstat_inc(rcvif, ifs6_in_error); 551 goto freeit; 552 } 553 ip6 = mtod(m, struct ip6_hdr *); 554 icmp6 = (struct icmp6_hdr *)(mtod(m, char *) + off); 555 } 556 KASSERT(ACCESSIBLE_POINTER(icmp6, struct ip6_hdr)); 557 558 /* 559 * calculate the checksum 560 */ 561 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 562 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 563 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src)); 564 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 565 icmp6_ifstat_inc(rcvif, ifs6_in_error); 566 goto freeit; 567 } 568 569 #if defined(NFAITH) && 0 < NFAITH 570 if (faithprefix(&ip6->ip6_dst)) { 571 /* 572 * Deliver very specific ICMP6 type only. 573 * This is important to deliver TOOBIG. Otherwise PMTUD 574 * will not work. 575 */ 576 switch (icmp6->icmp6_type) { 577 case ICMP6_DST_UNREACH: 578 case ICMP6_PACKET_TOO_BIG: 579 case ICMP6_TIME_EXCEEDED: 580 break; 581 default: 582 goto freeit; 583 } 584 } 585 #endif 586 587 code = icmp6->icmp6_code; 588 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 589 590 switch (icmp6->icmp6_type) { 591 case ICMP6_DST_UNREACH: 592 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 593 switch (code) { 594 case ICMP6_DST_UNREACH_NOROUTE: 595 code = PRC_UNREACH_NET; 596 break; 597 case ICMP6_DST_UNREACH_ADMIN: 598 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 599 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 600 break; 601 case ICMP6_DST_UNREACH_ADDR: 602 code = PRC_HOSTDEAD; 603 break; 604 case ICMP6_DST_UNREACH_BEYONDSCOPE: 605 /* I mean "source address was incorrect." */ 606 code = PRC_UNREACH_NET; 607 break; 608 case ICMP6_DST_UNREACH_NOPORT: 609 code = PRC_UNREACH_PORT; 610 break; 611 default: 612 goto badcode; 613 } 614 goto deliver; 615 616 case ICMP6_PACKET_TOO_BIG: 617 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 618 619 /* 620 * MTU is checked in icmp6_mtudisc. 621 */ 622 code = PRC_MSGSIZE; 623 624 /* 625 * Updating the path MTU will be done after examining 626 * intermediate extension headers. 627 */ 628 goto deliver; 629 630 case ICMP6_TIME_EXCEEDED: 631 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 632 switch (code) { 633 case ICMP6_TIME_EXCEED_TRANSIT: 634 code = PRC_TIMXCEED_INTRANS; 635 break; 636 case ICMP6_TIME_EXCEED_REASSEMBLY: 637 code = PRC_TIMXCEED_REASS; 638 break; 639 default: 640 goto badcode; 641 } 642 goto deliver; 643 644 case ICMP6_PARAM_PROB: 645 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 646 switch (code) { 647 case ICMP6_PARAMPROB_NEXTHEADER: 648 code = PRC_UNREACH_PROTOCOL; 649 break; 650 case ICMP6_PARAMPROB_HEADER: 651 case ICMP6_PARAMPROB_OPTION: 652 code = PRC_PARAMPROB; 653 break; 654 default: 655 goto badcode; 656 } 657 goto deliver; 658 659 case ICMP6_ECHO_REQUEST: 660 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 661 if (code != 0) 662 goto badcode; 663 /* 664 * Copy mbuf to send to two data paths: userland socket(s), 665 * and to the querier (echo reply). 666 * m: a copy for socket, n: a copy for querier 667 * 668 * If the first mbuf is shared, or the first mbuf is too short, 669 * copy the first part of the data into a fresh mbuf. 670 * Otherwise, we will wrongly overwrite both copies. 671 */ 672 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 673 /* Give up local */ 674 n = m; 675 m = NULL; 676 } else if (M_UNWRITABLE(n, off + sizeof(struct icmp6_hdr))) { 677 struct mbuf *n0 = n; 678 679 /* 680 * Prepare an internal mbuf. m_pullup() doesn't 681 * always copy the length we specified. 682 */ 683 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 684 /* Give up local */ 685 n = m; 686 m = NULL; 687 } 688 m_freem(n0); 689 } 690 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 691 sizeof(*nicmp6)); 692 if (nicmp6 == NULL) 693 goto freeit; 694 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 695 nicmp6->icmp6_code = 0; 696 if (n) { 697 net_stat_ref_t icmp6s = ICMP6_STAT_GETREF(); 698 _NET_STATINC_REF(icmp6s, ICMP6_STAT_REFLECT); 699 _NET_STATINC_REF(icmp6s, 700 ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY); 701 ICMP6_STAT_PUTREF(); 702 icmp6_reflect(n, off); 703 } 704 if (!m) 705 goto freeit; 706 break; 707 708 case ICMP6_ECHO_REPLY: 709 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 710 if (code != 0) 711 goto badcode; 712 break; 713 714 case MLD_LISTENER_QUERY: 715 case MLD_LISTENER_REPORT: 716 if (icmp6len < sizeof(struct mld_hdr)) 717 goto badlen; 718 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 719 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 720 else 721 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 722 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 723 /* give up local */ 724 mld_input(m, off); 725 m = NULL; 726 goto freeit; 727 } 728 mld_input(n, off); 729 /* m stays. */ 730 break; 731 732 case MLD_LISTENER_DONE: 733 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 734 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 735 goto badlen; 736 break; /* nothing to be done in kernel */ 737 738 case MLD_MTRACE_RESP: 739 case MLD_MTRACE: 740 /* XXX: these two are experimental. not officially defined. */ 741 /* XXX: per-interface statistics? */ 742 break; /* just pass it to applications */ 743 744 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 745 { 746 enum { WRU, FQDN } mode; 747 748 if (!icmp6_nodeinfo) 749 break; 750 751 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 752 mode = WRU; 753 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 754 mode = FQDN; 755 else 756 goto badlen; 757 758 if (mode == FQDN) { 759 n = m_copypacket(m, M_DONTWAIT); 760 if (n) 761 n = ni6_input(n, off); 762 } else { 763 u_char *p; 764 int maxhlen; 765 766 if ((icmp6_nodeinfo & 5) != 5) 767 break; 768 769 if (code != 0) 770 goto badcode; 771 MGETHDR(n, M_DONTWAIT, m->m_type); 772 if (n && ICMP6_MAXLEN > MHLEN) { 773 MCLGET(n, M_DONTWAIT); 774 if ((n->m_flags & M_EXT) == 0) { 775 m_free(n); 776 n = NULL; 777 } 778 } 779 if (n == NULL) { 780 /* Give up remote */ 781 break; 782 } 783 m_reset_rcvif(n); 784 n->m_len = 0; 785 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 786 if (maxhlen < 0) { 787 m_free(n); 788 break; 789 } 790 if (maxhlen > hostnamelen) 791 maxhlen = hostnamelen; 792 /* 793 * Copy IPv6 and ICMPv6 only. 794 */ 795 nip6 = mtod(n, struct ip6_hdr *); 796 memcpy(nip6, ip6, sizeof(struct ip6_hdr)); 797 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 798 memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr)); 799 800 p = (u_char *)(nicmp6 + 1); 801 memset(p, 0, 4); 802 memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */ 803 804 m_copy_pkthdr(n, m); 805 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 806 sizeof(struct icmp6_hdr) + 4 + maxhlen; 807 nicmp6->icmp6_type = ICMP6_WRUREPLY; 808 nicmp6->icmp6_code = 0; 809 } 810 if (n) { 811 net_stat_ref_t icmp6s = ICMP6_STAT_GETREF(); 812 _NET_STATINC_REF(icmp6s, ICMP6_STAT_REFLECT); 813 _NET_STATINC_REF(icmp6s, 814 ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY); 815 ICMP6_STAT_PUTREF(); 816 icmp6_reflect(n, sizeof(struct ip6_hdr)); 817 } 818 break; 819 } 820 821 case ICMP6_WRUREPLY: 822 if (code != 0) 823 goto badcode; 824 break; 825 826 case ND_ROUTER_SOLICIT: 827 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 828 /* FALLTHROUGH */ 829 case ND_ROUTER_ADVERT: 830 if (icmp6->icmp6_type == ND_ROUTER_ADVERT) 831 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 832 if (code != 0) 833 goto badcode; 834 if ((icmp6->icmp6_type == ND_ROUTER_SOLICIT && 835 icmp6len < sizeof(struct nd_router_solicit)) || 836 (icmp6->icmp6_type == ND_ROUTER_ADVERT && 837 icmp6len < sizeof(struct nd_router_advert))) 838 goto badlen; 839 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 840 /* give up local */ 841 nd6_rtr_cache(m, off, icmp6len, icmp6->icmp6_type); 842 m = NULL; 843 goto freeit; 844 } 845 nd6_rtr_cache(n, off, icmp6len, icmp6->icmp6_type); 846 /* m stays. */ 847 break; 848 849 case ND_NEIGHBOR_SOLICIT: 850 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 851 if (code != 0) 852 goto badcode; 853 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 854 goto badlen; 855 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 856 /* give up local */ 857 nd6_ns_input(m, off, icmp6len); 858 m = NULL; 859 goto freeit; 860 } 861 nd6_ns_input(n, off, icmp6len); 862 /* m stays. */ 863 break; 864 865 case ND_NEIGHBOR_ADVERT: 866 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 867 if (code != 0) 868 goto badcode; 869 if (icmp6len < sizeof(struct nd_neighbor_advert)) 870 goto badlen; 871 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 872 /* give up local */ 873 nd6_na_input(m, off, icmp6len); 874 m = NULL; 875 goto freeit; 876 } 877 nd6_na_input(n, off, icmp6len); 878 /* m stays. */ 879 break; 880 881 case ND_REDIRECT: 882 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 883 if (code != 0) 884 goto badcode; 885 if (icmp6len < sizeof(struct nd_redirect)) 886 goto badlen; 887 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 888 /* give up local */ 889 icmp6_redirect_input(m, off); 890 m = NULL; 891 goto freeit; 892 } 893 icmp6_redirect_input(n, off); 894 /* m stays. */ 895 break; 896 897 case ICMP6_ROUTER_RENUMBERING: 898 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 899 code != ICMP6_ROUTER_RENUMBERING_RESULT) 900 goto badcode; 901 if (icmp6len < sizeof(struct icmp6_router_renum)) 902 goto badlen; 903 break; 904 905 default: 906 nd6log(LOG_DEBUG, 907 "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 908 icmp6->icmp6_type, 909 IN6_PRINT(ip6buf, &ip6->ip6_src), 910 IN6_PRINT(ip6buf2, &ip6->ip6_dst), 911 rcvif ? rcvif->if_index : 0); 912 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 913 /* ICMPv6 error: MUST deliver it by spec... */ 914 code = PRC_NCMDS; 915 /* deliver */ 916 } else { 917 /* ICMPv6 informational: MUST not deliver */ 918 break; 919 } 920 deliver: 921 if (icmp6_notify_error(m, off, icmp6len, code)) { 922 /* In this case, m should've been freed. */ 923 m_put_rcvif_psref(rcvif, &psref); 924 return; 925 } 926 break; 927 928 badcode: 929 ICMP6_STATINC(ICMP6_STAT_BADCODE); 930 break; 931 932 badlen: 933 ICMP6_STATINC(ICMP6_STAT_BADLEN); 934 break; 935 } 936 m_put_rcvif_psref(rcvif, &psref); 937 938 /* deliver the packet to appropriate sockets */ 939 icmp6_rip6_input(&m, off); 940 941 return; 942 943 freeit: 944 m_put_rcvif_psref(rcvif, &psref); 945 m_freem(m); 946 return; 947 } 948 949 int 950 icmp6_input(struct mbuf **mp, int *offp, int proto) 951 { 952 953 wqinput_input(icmp6_wqinput, *mp, *offp, proto); 954 955 return IPPROTO_DONE; 956 } 957 958 static int 959 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 960 { 961 struct icmp6_hdr *icmp6; 962 struct ip6_hdr *eip6; 963 u_int32_t notifymtu; 964 struct sockaddr_in6 icmp6src, icmp6dst; 965 966 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 967 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 968 goto freeit; 969 } 970 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 971 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 972 if (icmp6 == NULL) { 973 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 974 return (-1); 975 } 976 eip6 = (struct ip6_hdr *)(icmp6 + 1); 977 978 /* Detect the upper level protocol */ 979 { 980 void *(*ctlfunc)(int, const struct sockaddr *, void *); 981 u_int8_t nxt = eip6->ip6_nxt; 982 int eoff = off + sizeof(struct icmp6_hdr) + 983 sizeof(struct ip6_hdr); 984 struct ip6ctlparam ip6cp; 985 struct in6_addr *finaldst = NULL; 986 int icmp6type = icmp6->icmp6_type; 987 struct ip6_frag *fh; 988 struct ip6_rthdr *rth; 989 struct ifnet *rcvif; 990 int s; 991 992 while (1) { /* XXX: should avoid infinite loop explicitly? */ 993 struct ip6_ext *eh; 994 995 switch (nxt) { 996 case IPPROTO_HOPOPTS: 997 case IPPROTO_DSTOPTS: 998 case IPPROTO_AH: 999 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 1000 eoff, sizeof(*eh)); 1001 if (eh == NULL) { 1002 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1003 return (-1); 1004 } 1005 1006 if (nxt == IPPROTO_AH) 1007 eoff += (eh->ip6e_len + 2) << 2; 1008 else 1009 eoff += (eh->ip6e_len + 1) << 3; 1010 nxt = eh->ip6e_nxt; 1011 break; 1012 case IPPROTO_ROUTING: 1013 /* Ignore the option. */ 1014 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 1015 eoff, sizeof(*rth)); 1016 if (rth == NULL) { 1017 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1018 return (-1); 1019 } 1020 1021 eoff += (rth->ip6r_len + 1) << 3; 1022 nxt = rth->ip6r_nxt; 1023 break; 1024 case IPPROTO_FRAGMENT: 1025 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1026 eoff, sizeof(*fh)); 1027 if (fh == NULL) { 1028 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1029 return (-1); 1030 } 1031 /* 1032 * Data after a fragment header is meaningless 1033 * unless it is the first fragment, but 1034 * we'll go to the notify label for path MTU 1035 * discovery. 1036 */ 1037 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1038 goto notify; 1039 1040 eoff += sizeof(struct ip6_frag); 1041 nxt = fh->ip6f_nxt; 1042 break; 1043 default: 1044 /* 1045 * This case includes ESP and the No Next 1046 * Header. In such cases going to the notify 1047 * label does not have any meaning 1048 * (i.e. ctlfunc will be NULL), but we go 1049 * anyway since we might have to update 1050 * path MTU information. 1051 */ 1052 goto notify; 1053 } 1054 } 1055 notify: 1056 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1057 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1058 if (icmp6 == NULL) { 1059 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1060 return (-1); 1061 } 1062 1063 /* 1064 * retrieve parameters from the inner IPv6 header, and convert 1065 * them into sockaddr structures. 1066 * XXX: there is no guarantee that the source or destination 1067 * addresses of the inner packet are in the same scope zone as 1068 * the addresses of the icmp packet. But there is no other 1069 * way to determine the zone. 1070 */ 1071 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1072 1073 rcvif = m_get_rcvif(m, &s); 1074 if (__predict_false(rcvif == NULL)) 1075 goto freeit; 1076 sockaddr_in6_init(&icmp6dst, 1077 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1078 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1079 m_put_rcvif(rcvif, &s); 1080 goto freeit; 1081 } 1082 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1083 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1084 m_put_rcvif(rcvif, &s); 1085 goto freeit; 1086 } 1087 m_put_rcvif(rcvif, &s); 1088 1089 icmp6src.sin6_flowinfo = 1090 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1091 1092 if (finaldst == NULL) 1093 finaldst = &eip6->ip6_dst; 1094 ip6cp.ip6c_m = m; 1095 ip6cp.ip6c_icmp6 = icmp6; 1096 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1097 ip6cp.ip6c_off = eoff; 1098 ip6cp.ip6c_finaldst = finaldst; 1099 ip6cp.ip6c_src = &icmp6src; 1100 ip6cp.ip6c_nxt = nxt; 1101 1102 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1103 notifymtu = ntohl(icmp6->icmp6_mtu); 1104 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1105 } 1106 1107 ctlfunc = inet6sw[ip6_protox[nxt]].pr_ctlinput; 1108 if (ctlfunc) { 1109 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp); 1110 } 1111 } 1112 return (0); 1113 1114 freeit: 1115 m_freem(m); 1116 return (-1); 1117 } 1118 1119 void 1120 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1121 { 1122 unsigned long rtcount; 1123 struct icmp6_mtudisc_callback *mc; 1124 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1125 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1126 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1127 u_int mtu = ntohl(icmp6->icmp6_mtu); 1128 struct rtentry *rt = NULL; 1129 struct sockaddr_in6 sin6; 1130 struct ifnet *rcvif; 1131 int s; 1132 1133 /* 1134 * The MTU should not be less than the minimal IPv6 MTU except for the 1135 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1136 * In that one case, the MTU might be less than 1280. 1137 */ 1138 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1139 /* is the mtu even sane? */ 1140 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1141 return; 1142 if (!validated) 1143 return; 1144 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1145 } 1146 1147 /* 1148 * allow non-validated cases if memory is plenty, to make traffic 1149 * from non-connected pcb happy. 1150 */ 1151 mutex_enter(&icmp6_mtx); 1152 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1153 if (validated) { 1154 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1155 mutex_exit(&icmp6_mtx); 1156 return; 1157 } else if (0 <= icmp6_mtudisc_lowat && 1158 rtcount > icmp6_mtudisc_lowat) { 1159 /* 1160 * XXX nuke a victim, install the new one. 1161 */ 1162 } 1163 } else { 1164 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1165 mutex_exit(&icmp6_mtx); 1166 return; 1167 } 1168 } 1169 mutex_exit(&icmp6_mtx); 1170 1171 memset(&sin6, 0, sizeof(sin6)); 1172 sin6.sin6_family = PF_INET6; 1173 sin6.sin6_len = sizeof(struct sockaddr_in6); 1174 sin6.sin6_addr = *dst; 1175 rcvif = m_get_rcvif(m, &s); 1176 if (__predict_false(rcvif == NULL)) 1177 return; 1178 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1179 m_put_rcvif(rcvif, &s); 1180 return; 1181 } 1182 m_put_rcvif(rcvif, &s); 1183 1184 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1185 1186 if (rt && (rt->rt_flags & RTF_HOST) && 1187 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1188 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1189 if (mtu < rt->rt_ifp->if_mtu) { 1190 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1191 rt->rt_rmx.rmx_mtu = mtu; 1192 } 1193 } 1194 if (rt) { 1195 rt_unref(rt); 1196 } 1197 1198 /* 1199 * Notify protocols that the MTU for this destination 1200 * has changed. 1201 */ 1202 mutex_enter(&icmp6_mtx); 1203 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1204 mc = LIST_NEXT(mc, mc_list)) 1205 (*mc->mc_func)(&sin6.sin6_addr); 1206 mutex_exit(&icmp6_mtx); 1207 } 1208 1209 /* 1210 * Process a Node Information Query packet, based on 1211 * draft-ietf-ipngwg-icmp-name-lookups-07. 1212 * 1213 * Spec incompatibilities: 1214 * - IPv6 Subject address handling 1215 * - IPv4 Subject address handling support missing 1216 * - Proxy reply (answer even if it's not for me) 1217 * - joins NI group address at in6_ifattach() time only, does not cope 1218 * with hostname changes by sethostname(3) 1219 */ 1220 static struct mbuf * 1221 ni6_input(struct mbuf *m, int off) 1222 { 1223 struct icmp6_nodeinfo *ni6, *nni6; 1224 struct mbuf *n = NULL; 1225 u_int16_t qtype; 1226 int subjlen; 1227 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1228 struct ni_reply_fqdn *fqdn; 1229 int addrs; /* for NI_QTYPE_NODEADDR */ 1230 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1231 struct sockaddr_in6 sin6; /* ip6_dst */ 1232 struct in6_addr in6_subj; /* subject address */ 1233 struct ip6_hdr *ip6; 1234 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1235 char *subj = NULL; 1236 struct ifnet *rcvif; 1237 int s, ss; 1238 struct ifaddr *ifa; 1239 struct psref psref; 1240 1241 ip6 = mtod(m, struct ip6_hdr *); 1242 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1243 if (ni6 == NULL) { 1244 /* m is already reclaimed */ 1245 return NULL; 1246 } 1247 KASSERT((m->m_flags & M_PKTHDR) != 0); 1248 1249 /* 1250 * Validate IPv6 destination address. 1251 * 1252 * The Responder must discard the Query without further processing 1253 * unless it is one of the Responder's unicast or anycast addresses, or 1254 * a link-local scope multicast address which the Responder has joined. 1255 * [icmp-name-lookups-07, Section 4.] 1256 */ 1257 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1258 /* XXX scopeid */ 1259 ss = pserialize_read_enter(); 1260 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1261 if (ifa != NULL) { 1262 ; /* unicast/anycast, fine */ 1263 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) { 1264 ; /* link-local multicast, fine */ 1265 } else { 1266 pserialize_read_exit(ss); 1267 goto bad; 1268 } 1269 pserialize_read_exit(ss); 1270 1271 /* validate query Subject field. */ 1272 qtype = ntohs(ni6->ni_qtype); 1273 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1274 switch (qtype) { 1275 case NI_QTYPE_NOOP: 1276 case NI_QTYPE_SUPTYPES: 1277 /* 07 draft */ 1278 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1279 break; 1280 /* FALLTHROUGH */ 1281 case NI_QTYPE_FQDN: 1282 case NI_QTYPE_NODEADDR: 1283 case NI_QTYPE_IPV4ADDR: 1284 switch (ni6->ni_code) { 1285 case ICMP6_NI_SUBJ_IPV6: 1286 #if ICMP6_NI_SUBJ_IPV6 != 0 1287 case 0: 1288 #endif 1289 /* 1290 * backward compatibility - try to accept 03 draft 1291 * format, where no Subject is present. 1292 */ 1293 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1294 subjlen == 0) { 1295 oldfqdn++; 1296 break; 1297 } 1298 #if ICMP6_NI_SUBJ_IPV6 != 0 1299 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1300 goto bad; 1301 #endif 1302 1303 if (subjlen != sizeof(sin6.sin6_addr)) 1304 goto bad; 1305 1306 /* 1307 * Validate Subject address. 1308 * 1309 * Not sure what exactly "address belongs to the node" 1310 * means in the spec, is it just unicast, or what? 1311 * 1312 * At this moment we consider Subject address as 1313 * "belong to the node" if the Subject address equals 1314 * to the IPv6 destination address; validation for 1315 * IPv6 destination address should have done enough 1316 * check for us. 1317 * 1318 * We do not do proxy at this moment. 1319 */ 1320 /* m_pulldown instead of copy? */ 1321 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1322 subjlen, (void *)&in6_subj); 1323 rcvif = m_get_rcvif(m, &s); 1324 if (__predict_false(rcvif == NULL)) 1325 goto bad; 1326 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1327 m_put_rcvif(rcvif, &s); 1328 goto bad; 1329 } 1330 m_put_rcvif(rcvif, &s); 1331 1332 subj = (char *)&in6_subj; 1333 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1334 break; 1335 1336 /* 1337 * XXX if we are to allow other cases, we should really 1338 * be careful about scope here. 1339 * basically, we should disallow queries toward IPv6 1340 * destination X with subject Y, if scope(X) > scope(Y). 1341 * if we allow scope(X) > scope(Y), it will result in 1342 * information leakage across scope boundary. 1343 */ 1344 goto bad; 1345 1346 case ICMP6_NI_SUBJ_FQDN: 1347 /* 1348 * Validate Subject name with gethostname(3). 1349 * 1350 * The behavior may need some debate, since: 1351 * - we are not sure if the node has FQDN as 1352 * hostname (returned by gethostname(3)). 1353 * - the code does wildcard match for truncated names. 1354 * however, we are not sure if we want to perform 1355 * wildcard match, if gethostname(3) side has 1356 * truncated hostname. 1357 */ 1358 n = ni6_nametodns(hostname, hostnamelen, 0); 1359 if (!n || n->m_next || n->m_len == 0) 1360 goto bad; 1361 IP6_EXTHDR_GET(subj, char *, m, 1362 off + sizeof(struct icmp6_nodeinfo), subjlen); 1363 if (subj == NULL) 1364 goto bad; 1365 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1366 n->m_len)) { 1367 goto bad; 1368 } 1369 m_freem(n); 1370 n = NULL; 1371 break; 1372 1373 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1374 default: 1375 goto bad; 1376 } 1377 break; 1378 } 1379 1380 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1381 switch (qtype) { 1382 case NI_QTYPE_FQDN: 1383 if ((icmp6_nodeinfo & 1) == 0) 1384 goto bad; 1385 break; 1386 case NI_QTYPE_NODEADDR: 1387 case NI_QTYPE_IPV4ADDR: 1388 if ((icmp6_nodeinfo & 2) == 0) 1389 goto bad; 1390 break; 1391 } 1392 1393 /* guess reply length */ 1394 switch (qtype) { 1395 case NI_QTYPE_NOOP: 1396 break; /* no reply data */ 1397 case NI_QTYPE_SUPTYPES: 1398 replylen += sizeof(u_int32_t); 1399 break; 1400 case NI_QTYPE_FQDN: 1401 /* will append an mbuf */ 1402 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1403 break; 1404 case NI_QTYPE_NODEADDR: 1405 addrs = ni6_addrs(ni6, &ifp, subj, &psref); 1406 replylen += addrs * 1407 (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1408 if (replylen > MCLBYTES) 1409 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1410 break; 1411 case NI_QTYPE_IPV4ADDR: 1412 /* unsupported - should respond with unknown Qtype? */ 1413 goto bad; 1414 default: 1415 /* 1416 * XXX: We must return a reply with the ICMP6 code 1417 * `unknown Qtype' in this case. However we regard the case 1418 * as an FQDN query for backward compatibility. 1419 * Older versions set a random value to this field, 1420 * so it rarely varies in the defined qtypes. 1421 * But the mechanism is not reliable... 1422 * maybe we should obsolete older versions. 1423 */ 1424 qtype = NI_QTYPE_FQDN; 1425 /* will append an mbuf */ 1426 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1427 oldfqdn++; 1428 break; 1429 } 1430 1431 /* allocate an mbuf to reply. */ 1432 MGETHDR(n, M_DONTWAIT, m->m_type); 1433 if (n == NULL) { 1434 goto bad; 1435 } 1436 m_move_pkthdr(n, m); 1437 if (replylen > MHLEN) { 1438 if (replylen > MCLBYTES) { 1439 /* 1440 * XXX: should we try to allocate more? But MCLBYTES 1441 * is probably much larger than IPV6_MMTU... 1442 */ 1443 goto bad; 1444 } 1445 MCLGET(n, M_DONTWAIT); 1446 if ((n->m_flags & M_EXT) == 0) { 1447 goto bad; 1448 } 1449 } 1450 n->m_pkthdr.len = n->m_len = replylen; 1451 1452 /* copy mbuf header and IPv6 + Node Information base headers */ 1453 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1454 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1455 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1456 1457 /* qtype dependent procedure */ 1458 switch (qtype) { 1459 case NI_QTYPE_NOOP: 1460 nni6->ni_code = ICMP6_NI_SUCCESS; 1461 nni6->ni_flags = 0; 1462 break; 1463 case NI_QTYPE_SUPTYPES: 1464 { 1465 u_int32_t v; 1466 nni6->ni_code = ICMP6_NI_SUCCESS; 1467 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1468 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1469 v = (u_int32_t)htonl(0x0000000f); 1470 memcpy(nni6 + 1, &v, sizeof(u_int32_t)); 1471 break; 1472 } 1473 case NI_QTYPE_FQDN: 1474 nni6->ni_code = ICMP6_NI_SUCCESS; 1475 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1476 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 1477 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1478 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1479 /* 1480 * XXX do we really have FQDN in variable "hostname"? 1481 */ 1482 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1483 if (n->m_next == NULL) 1484 goto bad; 1485 /* XXX we assume that n->m_next is not a chain */ 1486 if (n->m_next->m_next != NULL) 1487 goto bad; 1488 n->m_pkthdr.len += n->m_next->m_len; 1489 break; 1490 case NI_QTYPE_NODEADDR: 1491 { 1492 int lenlim, copied; 1493 1494 nni6->ni_code = ICMP6_NI_SUCCESS; 1495 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1496 sizeof(struct icmp6_nodeinfo); 1497 lenlim = M_TRAILINGSPACE(n); 1498 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1499 if_put(ifp, &psref); 1500 ifp = NULL; 1501 /* update mbuf length */ 1502 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1503 sizeof(struct icmp6_nodeinfo) + copied; 1504 break; 1505 } 1506 default: 1507 panic("%s: impossible", __func__); 1508 break; 1509 } 1510 1511 nni6->ni_type = ICMP6_NI_REPLY; 1512 m_freem(m); 1513 return n; 1514 1515 bad: 1516 if_put(ifp, &psref); 1517 m_freem(m); 1518 m_freem(n); 1519 return NULL; 1520 } 1521 1522 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1523 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1524 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1525 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1526 1527 /* 1528 * make a mbuf with DNS-encoded string. no compression support. 1529 * 1530 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1531 * treated as truncated name (two \0 at the end). this is a wild guess. 1532 * 1533 * old - return pascal string if non-zero 1534 */ 1535 static struct mbuf * 1536 ni6_nametodns(const char *name, int namelen, int old) 1537 { 1538 struct mbuf *m; 1539 char *cp, *ep; 1540 const char *p, *q; 1541 int i, len, nterm; 1542 1543 if (old) 1544 len = namelen + 1; 1545 else 1546 len = MCLBYTES; 1547 1548 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1549 MGET(m, M_DONTWAIT, MT_DATA); 1550 if (m && len > MLEN) { 1551 MCLGET(m, M_DONTWAIT); 1552 if ((m->m_flags & M_EXT) == 0) 1553 goto fail; 1554 } 1555 if (!m) 1556 goto fail; 1557 m->m_next = NULL; 1558 1559 if (old) { 1560 m->m_len = len; 1561 *mtod(m, char *) = namelen; 1562 memcpy(mtod(m, char *) + 1, name, namelen); 1563 return m; 1564 } else { 1565 m->m_len = 0; 1566 cp = mtod(m, char *); 1567 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1568 1569 /* if not certain about my name, return empty buffer */ 1570 if (namelen == 0) 1571 return m; 1572 1573 /* 1574 * guess if it looks like shortened hostname, or FQDN. 1575 * shortened hostname needs two trailing "\0". 1576 */ 1577 i = 0; 1578 for (p = name; p < name + namelen; p++) { 1579 if (*p == '.') 1580 i++; 1581 } 1582 if (i < 2) 1583 nterm = 2; 1584 else 1585 nterm = 1; 1586 1587 p = name; 1588 while (cp < ep && p < name + namelen) { 1589 i = 0; 1590 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1591 i++; 1592 /* result does not fit into mbuf */ 1593 if (cp + i + 1 >= ep) 1594 goto fail; 1595 /* 1596 * DNS label length restriction, RFC1035 page 8. 1597 * "i == 0" case is included here to avoid returning 1598 * 0-length label on "foo..bar". 1599 */ 1600 if (i <= 0 || i >= 64) 1601 goto fail; 1602 *cp++ = i; 1603 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1604 goto fail; 1605 while (i > 0) { 1606 if (!isalnum(*p) && *p != '-') 1607 goto fail; 1608 if (isupper(*p)) { 1609 *cp++ = tolower(*p); 1610 p++; 1611 } else 1612 *cp++ = *p++; 1613 i--; 1614 } 1615 p = q; 1616 if (p < name + namelen && *p == '.') 1617 p++; 1618 } 1619 /* termination */ 1620 if (cp + nterm >= ep) 1621 goto fail; 1622 while (nterm-- > 0) 1623 *cp++ = '\0'; 1624 m->m_len = cp - mtod(m, char *); 1625 return m; 1626 } 1627 1628 panic("should not reach here"); 1629 /* NOTREACHED */ 1630 1631 fail: 1632 m_freem(m); 1633 return NULL; 1634 } 1635 1636 /* 1637 * check if two DNS-encoded string matches. takes care of truncated 1638 * form (with \0\0 at the end). no compression support. 1639 * XXX upper/lowercase match (see RFC2065) 1640 */ 1641 static int 1642 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1643 { 1644 const char *a0, *b0; 1645 int l; 1646 1647 /* simplest case - need validation? */ 1648 if (alen == blen && memcmp(a, b, alen) == 0) 1649 return 1; 1650 1651 a0 = a; 1652 b0 = b; 1653 1654 /* termination is mandatory */ 1655 if (alen < 2 || blen < 2) 1656 return 0; 1657 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1658 return 0; 1659 alen--; 1660 blen--; 1661 1662 while (a - a0 < alen && b - b0 < blen) { 1663 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1664 return 0; 1665 1666 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1667 return 0; 1668 /* we don't support compression yet */ 1669 if (a[0] >= 64 || b[0] >= 64) 1670 return 0; 1671 1672 /* truncated case */ 1673 if (a[0] == 0 && a - a0 == alen - 1) 1674 return 1; 1675 if (b[0] == 0 && b - b0 == blen - 1) 1676 return 1; 1677 if (a[0] == 0 || b[0] == 0) 1678 return 0; 1679 1680 if (a[0] != b[0]) 1681 return 0; 1682 l = a[0]; 1683 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1684 return 0; 1685 if (memcmp(a + 1, b + 1, l) != 0) 1686 return 0; 1687 1688 a += 1 + l; 1689 b += 1 + l; 1690 } 1691 1692 if (a - a0 == alen && b - b0 == blen) 1693 return 1; 1694 else 1695 return 0; 1696 } 1697 1698 /* 1699 * calculate the number of addresses to be returned in the node info reply. 1700 */ 1701 static int 1702 ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj, 1703 struct psref *psref) 1704 { 1705 struct ifnet *ifp; 1706 struct in6_ifaddr *ia6; 1707 struct ifaddr *ifa; 1708 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1709 int addrs = 0, addrsofif, iffound = 0; 1710 int niflags = ni6->ni_flags; 1711 int s; 1712 1713 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1714 switch (ni6->ni_code) { 1715 case ICMP6_NI_SUBJ_IPV6: 1716 if (subj == NULL) /* must be impossible... */ 1717 return 0; 1718 subj_ip6 = (struct sockaddr_in6 *)subj; 1719 break; 1720 default: 1721 /* 1722 * XXX: we only support IPv6 subject address for 1723 * this Qtype. 1724 */ 1725 return 0; 1726 } 1727 } 1728 1729 s = pserialize_read_enter(); 1730 IFNET_READER_FOREACH(ifp) { 1731 addrsofif = 0; 1732 IFADDR_READER_FOREACH(ifa, ifp) { 1733 if (ifa->ifa_addr->sa_family != AF_INET6) 1734 continue; 1735 ia6 = (struct in6_ifaddr *)ifa; 1736 1737 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1738 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1739 &ia6->ia_addr.sin6_addr)) 1740 iffound = 1; 1741 1742 /* 1743 * IPv4-mapped addresses can only be returned by a 1744 * Node Information proxy, since they represent 1745 * addresses of IPv4-only nodes, which perforce do 1746 * not implement this protocol. 1747 * [icmp-name-lookups-07, Section 5.4] 1748 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1749 * this function at this moment. 1750 */ 1751 1752 /* What do we have to do about ::1? */ 1753 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1754 case IPV6_ADDR_SCOPE_LINKLOCAL: 1755 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1756 continue; 1757 break; 1758 case IPV6_ADDR_SCOPE_SITELOCAL: 1759 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1760 continue; 1761 break; 1762 case IPV6_ADDR_SCOPE_GLOBAL: 1763 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1764 continue; 1765 break; 1766 default: 1767 continue; 1768 } 1769 1770 /* 1771 * check if anycast is okay. 1772 * XXX: just experimental. not in the spec. 1773 */ 1774 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1775 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1776 continue; /* we need only unicast addresses */ 1777 1778 addrsofif++; /* count the address */ 1779 } 1780 if (iffound) { 1781 if_acquire(ifp, psref); 1782 pserialize_read_exit(s); 1783 *ifpp = ifp; 1784 return addrsofif; 1785 } 1786 1787 addrs += addrsofif; 1788 } 1789 pserialize_read_exit(s); 1790 1791 return addrs; 1792 } 1793 1794 static int 1795 ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1796 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1797 int resid) 1798 { 1799 struct ifnet *ifp; 1800 struct in6_ifaddr *ia6; 1801 struct ifaddr *ifa; 1802 struct ifnet *ifp_dep = NULL; 1803 int copied = 0, allow_deprecated = 0; 1804 u_char *cp = (u_char *)(nni6 + 1); 1805 int niflags = ni6->ni_flags; 1806 u_int32_t ltime; 1807 int s; 1808 1809 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1810 return 0; /* needless to copy */ 1811 1812 s = pserialize_read_enter(); 1813 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1814 again: 1815 1816 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1817 { 1818 IFADDR_READER_FOREACH(ifa, ifp) { 1819 if (ifa->ifa_addr->sa_family != AF_INET6) 1820 continue; 1821 ia6 = (struct in6_ifaddr *)ifa; 1822 1823 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1824 allow_deprecated == 0) { 1825 /* 1826 * prefererred address should be put before 1827 * deprecated addresses. 1828 */ 1829 1830 /* record the interface for later search */ 1831 if (ifp_dep == NULL) 1832 ifp_dep = ifp; 1833 1834 continue; 1835 } 1836 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1837 allow_deprecated != 0) 1838 continue; /* we now collect deprecated addrs */ 1839 1840 /* What do we have to do about ::1? */ 1841 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1842 case IPV6_ADDR_SCOPE_LINKLOCAL: 1843 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1844 continue; 1845 break; 1846 case IPV6_ADDR_SCOPE_SITELOCAL: 1847 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1848 continue; 1849 break; 1850 case IPV6_ADDR_SCOPE_GLOBAL: 1851 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1852 continue; 1853 break; 1854 default: 1855 continue; 1856 } 1857 1858 /* 1859 * check if anycast is okay. 1860 * XXX: just experimental. not in the spec. 1861 */ 1862 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1863 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1864 continue; 1865 1866 /* now we can copy the address */ 1867 if (resid < sizeof(struct in6_addr) + 1868 sizeof(u_int32_t)) { 1869 /* 1870 * We give up much more copy. 1871 * Set the truncate flag and return. 1872 */ 1873 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1874 goto out; 1875 } 1876 1877 /* 1878 * Set the TTL of the address. 1879 * The TTL value should be one of the following 1880 * according to the specification: 1881 * 1882 * 1. The remaining lifetime of a DHCP lease on the 1883 * address, or 1884 * 2. The remaining Valid Lifetime of a prefix from 1885 * which the address was derived through Stateless 1886 * Autoconfiguration. 1887 * 1888 * Note that we currently do not support stateful 1889 * address configuration by DHCPv6, so the former 1890 * case can't happen. 1891 * 1892 * TTL must be 2^31 > TTL >= 0. 1893 */ 1894 if (ia6->ia6_lifetime.ia6t_expire == 0) 1895 ltime = ND6_INFINITE_LIFETIME; 1896 else { 1897 if (ia6->ia6_lifetime.ia6t_expire > 1898 time_uptime) 1899 ltime = ia6->ia6_lifetime.ia6t_expire - 1900 time_uptime; 1901 else 1902 ltime = 0; 1903 } 1904 if (ltime > 0x7fffffff) 1905 ltime = 0x7fffffff; 1906 ltime = htonl(ltime); 1907 1908 memcpy(cp, <ime, sizeof(u_int32_t)); 1909 cp += sizeof(u_int32_t); 1910 1911 /* copy the address itself */ 1912 bcopy(&ia6->ia_addr.sin6_addr, cp, 1913 sizeof(struct in6_addr)); 1914 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1915 cp += sizeof(struct in6_addr); 1916 1917 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1918 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1919 } 1920 if (ifp0) /* we need search only on the specified IF */ 1921 break; 1922 } 1923 1924 if (allow_deprecated == 0 && ifp_dep != NULL) { 1925 ifp = ifp_dep; 1926 allow_deprecated = 1; 1927 1928 goto again; 1929 } 1930 out: 1931 pserialize_read_exit(s); 1932 return copied; 1933 } 1934 1935 /* 1936 * XXX almost dup'ed code with rip6_input. 1937 */ 1938 static int 1939 icmp6_rip6_input(struct mbuf **mp, int off) 1940 { 1941 struct mbuf *m = *mp; 1942 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1943 struct inpcb *inp; 1944 struct inpcb *last = NULL; 1945 struct sockaddr_in6 rip6src; 1946 struct icmp6_hdr *icmp6; 1947 struct mbuf *n, *opts = NULL; 1948 1949 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1950 if (icmp6 == NULL) { 1951 /* m is already reclaimed */ 1952 return IPPROTO_DONE; 1953 } 1954 1955 /* 1956 * XXX: the address may have embedded scope zone ID, which should be 1957 * hidden from applications. 1958 */ 1959 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1960 if (sa6_recoverscope(&rip6src)) { 1961 m_freem(m); 1962 return IPPROTO_DONE; 1963 } 1964 1965 TAILQ_FOREACH(inp, &raw6cbtable.inpt_queue, inp_queue) { 1966 if (inp->inp_af != AF_INET6) 1967 continue; 1968 if (in6p_ip6(inp).ip6_nxt != IPPROTO_ICMPV6) 1969 continue; 1970 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_laddr(inp)) && 1971 !IN6_ARE_ADDR_EQUAL(&in6p_laddr(inp), &ip6->ip6_dst)) 1972 continue; 1973 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_faddr(inp)) && 1974 !IN6_ARE_ADDR_EQUAL(&in6p_faddr(inp), &ip6->ip6_src)) 1975 continue; 1976 if (in6p_icmp6filt(inp) && 1977 ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1978 in6p_icmp6filt(inp))) 1979 continue; 1980 1981 if (last == NULL) { 1982 ; 1983 } 1984 #ifdef IPSEC 1985 else if (ipsec_used && ipsec_in_reject(m, last)) { 1986 /* do not inject data into pcb */ 1987 } 1988 #endif 1989 else if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 1990 if (last->inp_flags & IN6P_CONTROLOPTS || 1991 SOOPT_TIMESTAMP(last->inp_socket->so_options)) 1992 ip6_savecontrol(last, &opts, ip6, n); 1993 /* strip intermediate headers */ 1994 m_adj(n, off); 1995 if (sbappendaddr(&last->inp_socket->so_rcv, 1996 sin6tosa(&rip6src), n, opts) == 0) { 1997 soroverflow(last->inp_socket); 1998 m_freem(n); 1999 m_freem(opts); 2000 } else { 2001 sorwakeup(last->inp_socket); 2002 } 2003 opts = NULL; 2004 } 2005 2006 last = inp; 2007 } 2008 2009 #ifdef IPSEC 2010 if (ipsec_used && last && ipsec_in_reject(m, last)) { 2011 m_freem(m); 2012 IP6_STATDEC(IP6_STAT_DELIVERED); 2013 /* do not inject data into pcb */ 2014 } else 2015 #endif 2016 if (last) { 2017 if (last->inp_flags & IN6P_CONTROLOPTS || 2018 SOOPT_TIMESTAMP(last->inp_socket->so_options)) 2019 ip6_savecontrol(last, &opts, ip6, m); 2020 /* strip intermediate headers */ 2021 m_adj(m, off); 2022 if (sbappendaddr(&last->inp_socket->so_rcv, 2023 sin6tosa(&rip6src), m, opts) == 0) { 2024 soroverflow(last->inp_socket); 2025 m_freem(m); 2026 m_freem(opts); 2027 } else { 2028 sorwakeup(last->inp_socket); 2029 } 2030 } else { 2031 m_freem(m); 2032 IP6_STATDEC(IP6_STAT_DELIVERED); 2033 } 2034 return IPPROTO_DONE; 2035 } 2036 2037 /* 2038 * Reflect the ip6 packet back to the source. 2039 * OFF points to the icmp6 header, counted from the top of the mbuf. 2040 * 2041 * Note: RFC 1885 required that an echo reply should be truncated if it 2042 * did not fit in with (return) path MTU, and KAME code supported the 2043 * behavior. However, as a clarification after the RFC, this limitation 2044 * was removed in a revised version of the spec, RFC 2463. We had kept the 2045 * old behavior, with a (non-default) ifdef block, while the new version of 2046 * the spec was an internet-draft status, and even after the new RFC was 2047 * published. But it would rather make sense to clean the obsoleted part 2048 * up, and to make the code simpler at this stage. 2049 */ 2050 static void 2051 icmp6_reflect(struct mbuf *m, size_t off) 2052 { 2053 struct ip6_hdr *ip6; 2054 struct icmp6_hdr *icmp6; 2055 const struct in6_ifaddr *ia; 2056 const struct ip6aux *ip6a; 2057 int plen; 2058 int type, code; 2059 struct ifnet *outif = NULL; 2060 struct in6_addr origdst; 2061 struct ifnet *rcvif; 2062 int s; 2063 bool ip6_src_filled = false; 2064 int flags; 2065 2066 /* too short to reflect */ 2067 if (off < sizeof(struct ip6_hdr)) { 2068 nd6log(LOG_DEBUG, 2069 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2070 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2071 __FILE__, __LINE__); 2072 goto bad; 2073 } 2074 2075 /* 2076 * If there are extra headers between IPv6 and ICMPv6, strip 2077 * off that header first. 2078 */ 2079 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 2080 if (off > sizeof(struct ip6_hdr)) { 2081 size_t l; 2082 struct ip6_hdr nip6; 2083 2084 l = off - sizeof(struct ip6_hdr); 2085 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2086 m_adj(m, l); 2087 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2088 if (m->m_len < l) { 2089 if ((m = m_pullup(m, l)) == NULL) 2090 return; 2091 } 2092 memcpy(mtod(m, void *), (void *)&nip6, sizeof(nip6)); 2093 } else { 2094 size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2095 if (m->m_len < l) { 2096 if ((m = m_pullup(m, l)) == NULL) 2097 return; 2098 } 2099 } 2100 2101 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2102 ip6 = mtod(m, struct ip6_hdr *); 2103 ip6->ip6_nxt = IPPROTO_ICMPV6; 2104 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2105 type = icmp6->icmp6_type; /* keep type for statistics */ 2106 code = icmp6->icmp6_code; /* ditto. */ 2107 2108 origdst = ip6->ip6_dst; 2109 /* 2110 * ip6_input() drops a packet if its src is multicast. 2111 * So, the src is never multicast. 2112 */ 2113 ip6->ip6_dst = ip6->ip6_src; 2114 2115 /* 2116 * If the incoming packet was addressed directly to us (i.e. unicast), 2117 * use dst as the src for the reply. 2118 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2119 * (for example) when we encounter an error while forwarding procedure 2120 * destined to a duplicated address of ours. 2121 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2122 * procedure of an outgoing packet of our own, in which case we need 2123 * to search in the ifaddr list. 2124 */ 2125 if (IN6_IS_ADDR_MULTICAST(&origdst)) { 2126 ; 2127 } else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2128 if ((ip6a->ip6a_flags & 2129 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2130 ip6->ip6_src = ip6a->ip6a_src; 2131 ip6_src_filled = true; 2132 } 2133 } else { 2134 union { 2135 struct sockaddr_in6 sin6; 2136 struct sockaddr sa; 2137 } u; 2138 int _s; 2139 struct ifaddr *ifa; 2140 2141 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2142 2143 _s = pserialize_read_enter(); 2144 ifa = ifa_ifwithaddr(&u.sa); 2145 2146 if (ifa != NULL) { 2147 ia = ifatoia6(ifa); 2148 if ((ia->ia6_flags & 2149 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2150 ip6->ip6_src = ia->ia_addr.sin6_addr; 2151 ip6_src_filled = true; 2152 } 2153 } 2154 pserialize_read_exit(_s); 2155 } 2156 2157 if (!ip6_src_filled) { 2158 int e; 2159 struct sockaddr_in6 sin6; 2160 struct route ro; 2161 2162 /* 2163 * This case matches to multicasts, our anycast, or unicasts 2164 * that we do not own. Select a source address based on the 2165 * source address of the erroneous packet. 2166 */ 2167 /* zone ID should be embedded */ 2168 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2169 2170 memset(&ro, 0, sizeof(ro)); 2171 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2172 &ip6->ip6_src); 2173 rtcache_free(&ro); 2174 if (e != 0) { 2175 char ip6buf[INET6_ADDRSTRLEN]; 2176 nd6log(LOG_DEBUG, 2177 "source can't be determined: " 2178 "dst=%s, error=%d\n", 2179 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2180 goto bad; 2181 } 2182 } 2183 2184 ip6->ip6_flow = 0; 2185 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2186 ip6->ip6_vfc |= IPV6_VERSION; 2187 ip6->ip6_nxt = IPPROTO_ICMPV6; 2188 rcvif = m_get_rcvif(m, &s); 2189 if (rcvif) { 2190 /* XXX: This may not be the outgoing interface */ 2191 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2192 } else { 2193 ip6->ip6_hlim = ip6_defhlim; 2194 } 2195 m_put_rcvif(rcvif, &s); 2196 2197 m->m_pkthdr.csum_flags = 0; 2198 icmp6->icmp6_cksum = 0; 2199 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2200 sizeof(struct ip6_hdr), plen); 2201 2202 /* 2203 * XXX option handling 2204 */ 2205 2206 m->m_flags &= ~(M_BCAST|M_MCAST); 2207 2208 /* 2209 * Note for icmp6_reflect_pmtu == false 2210 * To avoid a "too big" situation at an intermediate router 2211 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2212 * Note that only echo and node information replies are affected, 2213 * since the length of ICMP6 errors is limited to the minimum MTU. 2214 */ 2215 flags = icmp6_reflect_pmtu ? 0 : IPV6_MINMTU; 2216 if (ip6_output(m, NULL, NULL, flags, NULL, NULL, &outif) != 0 && 2217 outif) 2218 icmp6_ifstat_inc(outif, ifs6_out_error); 2219 if (outif) 2220 icmp6_ifoutstat_inc(outif, type, code); 2221 2222 return; 2223 2224 bad: 2225 m_freem(m); 2226 return; 2227 } 2228 2229 static const char * 2230 icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, 2231 struct in6_addr *dst6, struct in6_addr *tgt6) 2232 { 2233 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2234 char ip6buft[INET6_ADDRSTRLEN]; 2235 2236 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2237 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2238 IN6_PRINT(ip6buft, tgt6)); 2239 return buf; 2240 } 2241 2242 static void 2243 icmp6_redirect_input(struct mbuf *m, int off) 2244 { 2245 struct ifnet *ifp; 2246 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2247 struct nd_redirect *nd_rd; 2248 int icmp6len = m->m_pkthdr.len - off; 2249 char *lladdr = NULL; 2250 int lladdrlen = 0; 2251 struct rtentry *rt = NULL; 2252 int is_router; 2253 int is_onlink; 2254 struct in6_addr src6 = ip6->ip6_src; 2255 struct in6_addr redtgt6; 2256 struct in6_addr reddst6; 2257 union nd_opts ndopts; 2258 struct psref psref; 2259 char ip6buf[INET6_ADDRSTRLEN]; 2260 char diagbuf[256]; 2261 2262 ifp = m_get_rcvif_psref(m, &psref); 2263 if (ifp == NULL) 2264 goto freeit; 2265 2266 /* XXX if we are router, we don't update route by icmp6 redirect */ 2267 if (ip6_forwarding) 2268 goto freeit; 2269 if (!icmp6_rediraccept) 2270 goto freeit; 2271 2272 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2273 if (nd_rd == NULL) { 2274 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2275 m_put_rcvif_psref(ifp, &psref); 2276 return; 2277 } 2278 redtgt6 = nd_rd->nd_rd_target; 2279 reddst6 = nd_rd->nd_rd_dst; 2280 2281 if (in6_setscope(&redtgt6, ifp, NULL) || 2282 in6_setscope(&reddst6, ifp, NULL)) { 2283 goto freeit; 2284 } 2285 2286 /* validation */ 2287 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2288 nd6log(LOG_ERR, 2289 "ICMP6 redirect sent from %s rejected; " 2290 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2291 goto bad; 2292 } 2293 if (ip6->ip6_hlim != 255) { 2294 nd6log(LOG_ERR, 2295 "ICMP6 redirect sent from %s rejected; " 2296 "hlim=%d (must be 255)\n", 2297 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2298 goto bad; 2299 } 2300 2301 { 2302 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2303 struct sockaddr_in6 sin6; 2304 struct in6_addr *gw6; 2305 2306 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2307 rt = rtalloc1(sin6tosa(&sin6), 0); 2308 if (rt) { 2309 if (rt->rt_gateway == NULL || 2310 rt->rt_gateway->sa_family != AF_INET6) { 2311 nd6log(LOG_ERR, 2312 "ICMP6 redirect rejected; no route " 2313 "with inet6 gateway found for redirect dst: %s\n", 2314 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2315 &src6, &reddst6, &redtgt6)); 2316 rt_unref(rt); 2317 goto bad; 2318 } 2319 2320 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2321 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2322 nd6log(LOG_ERR, 2323 "ICMP6 redirect rejected; " 2324 "not equal to gw-for-src=%s (must be same): %s\n", 2325 IN6_PRINT(ip6buf, gw6), 2326 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2327 &src6, &reddst6, &redtgt6)); 2328 rt_unref(rt); 2329 goto bad; 2330 } 2331 } else { 2332 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2333 "no route found for redirect dst: %s\n", 2334 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2335 &src6, &reddst6, &redtgt6)); 2336 goto bad; 2337 } 2338 rt_unref(rt); 2339 rt = NULL; 2340 } 2341 2342 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2343 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2344 "redirect dst must be unicast: %s\n", 2345 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2346 &src6, &reddst6, &redtgt6)); 2347 goto bad; 2348 } 2349 2350 is_router = is_onlink = 0; 2351 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2352 is_router = 1; /* router case */ 2353 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2354 is_onlink = 1; /* on-link destination case */ 2355 if (!is_router && !is_onlink) { 2356 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2357 "neither router case nor onlink case: %s\n", 2358 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2359 &src6, &reddst6, &redtgt6)); 2360 goto bad; 2361 } 2362 /* validation passed */ 2363 2364 icmp6len -= sizeof(*nd_rd); 2365 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2366 if (nd6_options(&ndopts) < 0) { 2367 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2368 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2369 &src6, &reddst6, &redtgt6)); 2370 /* nd6_options have incremented stats */ 2371 goto freeit; 2372 } 2373 2374 if (ndopts.nd_opts_tgt_lladdr) { 2375 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2376 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2377 } 2378 2379 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2380 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2381 "(if %d, icmp6 packet %d): %s\n", 2382 IN6_PRINT(ip6buf, &redtgt6), 2383 ifp->if_addrlen, lladdrlen - 2, 2384 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2385 &src6, &reddst6, &redtgt6)); 2386 goto bad; 2387 } 2388 2389 /* RFC 2461 8.3 */ 2390 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2391 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2392 2393 m_put_rcvif_psref(ifp, &psref); 2394 ifp = NULL; 2395 2396 if (!is_onlink) { /* better router case. perform rtredirect. */ 2397 /* perform rtredirect */ 2398 struct sockaddr_in6 sdst; 2399 struct sockaddr_in6 sgw; 2400 struct sockaddr_in6 ssrc; 2401 unsigned long rtcount; 2402 struct rtentry *newrt = NULL; 2403 2404 /* 2405 * do not install redirect route, if the number of entries 2406 * is too much (> hiwat). note that, the node (= host) will 2407 * work just fine even if we do not install redirect route 2408 * (there will be additional hops, though). 2409 */ 2410 mutex_enter(&icmp6_mtx); 2411 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2412 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2413 mutex_exit(&icmp6_mtx); 2414 goto freeit; 2415 } 2416 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2417 mutex_exit(&icmp6_mtx); 2418 goto freeit; 2419 } else if (0 <= icmp6_redirect_lowat && 2420 rtcount > icmp6_redirect_lowat) { 2421 /* 2422 * XXX nuke a victim, install the new one. 2423 */ 2424 } 2425 2426 memset(&sdst, 0, sizeof(sdst)); 2427 memset(&sgw, 0, sizeof(sgw)); 2428 memset(&ssrc, 0, sizeof(ssrc)); 2429 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2430 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2431 sizeof(struct sockaddr_in6); 2432 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2433 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2434 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2435 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2436 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), &newrt); 2437 2438 if (newrt) { 2439 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2440 icmp6_redirect_timeout_q); 2441 rt_unref(newrt); 2442 } 2443 mutex_exit(&icmp6_mtx); 2444 } 2445 /* finally update cached route in each socket via pfctlinput */ 2446 { 2447 struct sockaddr_in6 sdst; 2448 2449 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2450 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2451 #if defined(IPSEC) 2452 if (ipsec_used) 2453 key_sa_routechange(sin6tosa(&sdst)); 2454 #endif 2455 } 2456 2457 freeit: 2458 if (ifp != NULL) 2459 m_put_rcvif_psref(ifp, &psref); 2460 m_freem(m); 2461 return; 2462 2463 bad: 2464 m_put_rcvif_psref(ifp, &psref); 2465 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2466 m_freem(m); 2467 } 2468 2469 void 2470 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2471 { 2472 struct ifnet *ifp; /* my outgoing interface */ 2473 struct in6_addr *ifp_ll6; 2474 struct in6_addr *nexthop; 2475 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2476 struct mbuf *m = NULL; /* newly allocated one */ 2477 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2478 struct nd_redirect *nd_rd; 2479 size_t maxlen; 2480 u_char *p; 2481 struct sockaddr_in6 src_sa; 2482 2483 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2484 2485 /* if we are not router, we don't send icmp6 redirect */ 2486 if (!ip6_forwarding) 2487 goto fail; 2488 2489 /* sanity check */ 2490 KASSERT(m0 != NULL); 2491 KASSERT(rt != NULL); 2492 2493 ifp = rt->rt_ifp; 2494 2495 /* 2496 * Address check: 2497 * the source address must identify a neighbor, and 2498 * the destination address must not be a multicast address 2499 * [RFC 2461, sec 8.2] 2500 */ 2501 sip6 = mtod(m0, struct ip6_hdr *); 2502 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2503 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2504 goto fail; 2505 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2506 goto fail; /* what should we do here? */ 2507 2508 /* rate limit */ 2509 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2510 goto fail; 2511 2512 /* 2513 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2514 * we almost always ask for an mbuf cluster for simplicity. 2515 * (MHLEN < IPV6_MMTU is almost always true) 2516 */ 2517 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2518 if (m && IPV6_MMTU >= MHLEN) { 2519 #if IPV6_MMTU >= MCLBYTES 2520 MEXTMALLOC(m, IPV6_MMTU, M_NOWAIT); 2521 #else 2522 MCLGET(m, M_DONTWAIT); 2523 #endif 2524 } 2525 2526 if (!m) 2527 goto fail; 2528 m_reset_rcvif(m); 2529 m->m_len = 0; 2530 maxlen = M_TRAILINGSPACE(m); 2531 maxlen = uimin(IPV6_MMTU, maxlen); 2532 2533 /* just for safety */ 2534 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct nd_redirect) + 2535 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2536 goto fail; 2537 } 2538 2539 { 2540 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2541 struct in6_ifaddr *ia; 2542 int s = pserialize_read_enter(); 2543 if ((ia = in6ifa_ifpforlinklocal(ifp, 2544 IN6_IFF_NOTREADY| 2545 IN6_IFF_ANYCAST)) == NULL) { 2546 pserialize_read_exit(s); 2547 goto fail; 2548 } 2549 ifp_ll6 = &ia->ia_addr.sin6_addr; 2550 pserialize_read_exit(s); 2551 } 2552 2553 /* get ip6 linklocal address for the router. */ 2554 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2555 struct sockaddr_in6 *sin6; 2556 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2557 nexthop = &sin6->sin6_addr; 2558 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2559 nexthop = NULL; 2560 } else 2561 nexthop = NULL; 2562 2563 /* ip6 */ 2564 ip6 = mtod(m, struct ip6_hdr *); 2565 ip6->ip6_flow = 0; 2566 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2567 ip6->ip6_vfc |= IPV6_VERSION; 2568 /* ip6->ip6_plen will be set later */ 2569 ip6->ip6_nxt = IPPROTO_ICMPV6; 2570 ip6->ip6_hlim = 255; 2571 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2572 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2573 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2574 2575 /* ND Redirect */ 2576 nd_rd = (struct nd_redirect *)(ip6 + 1); 2577 nd_rd->nd_rd_type = ND_REDIRECT; 2578 nd_rd->nd_rd_code = 0; 2579 nd_rd->nd_rd_reserved = 0; 2580 if (rt->rt_flags & RTF_GATEWAY) { 2581 /* 2582 * nd_rd->nd_rd_target must be a link-local address in 2583 * better router cases. 2584 */ 2585 if (!nexthop) 2586 goto fail; 2587 bcopy(nexthop, &nd_rd->nd_rd_target, 2588 sizeof(nd_rd->nd_rd_target)); 2589 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2590 sizeof(nd_rd->nd_rd_dst)); 2591 } else { 2592 /* make sure redtgt == reddst */ 2593 nexthop = &sip6->ip6_dst; 2594 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2595 sizeof(nd_rd->nd_rd_target)); 2596 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2597 sizeof(nd_rd->nd_rd_dst)); 2598 } 2599 2600 p = (u_char *)(nd_rd + 1); 2601 2602 { 2603 /* target lladdr option */ 2604 struct llentry *ln = NULL; 2605 int len, pad; 2606 struct nd_opt_hdr *nd_opt; 2607 char *lladdr; 2608 2609 ln = nd6_lookup(nexthop, ifp, false); 2610 if (ln == NULL) 2611 goto nolladdropt; 2612 len = sizeof(*nd_opt) + ifp->if_addrlen; 2613 len = (len + 7) & ~7; /* round by 8 */ 2614 pad = len - (sizeof(*nd_opt) + ifp->if_addrlen); 2615 2616 /* safety check */ 2617 if (len + (p - (u_char *)ip6) > maxlen) { 2618 LLE_RUNLOCK(ln); 2619 goto nolladdropt; 2620 } 2621 2622 if (ln->la_flags & LLE_VALID) { 2623 nd_opt = (struct nd_opt_hdr *)p; 2624 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2625 nd_opt->nd_opt_len = len >> 3; 2626 lladdr = (char *)(nd_opt + 1); 2627 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2628 memset(lladdr + ifp->if_addrlen, 0, pad); 2629 p += len; 2630 } 2631 LLE_RUNLOCK(ln); 2632 } 2633 nolladdropt: 2634 2635 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2636 2637 /* just to be safe */ 2638 if (m0->m_flags & M_DECRYPTED) 2639 goto noredhdropt; 2640 if (p - (u_char *)ip6 > maxlen) 2641 goto noredhdropt; 2642 2643 { 2644 /* redirected header option */ 2645 int len; 2646 struct nd_opt_rd_hdr *nd_opt_rh; 2647 2648 /* 2649 * compute the maximum size for icmp6 redirect header option. 2650 * XXX room for auth header? 2651 */ 2652 len = maxlen - (p - (u_char *)ip6); 2653 len &= ~7; 2654 2655 if (len < sizeof(*nd_opt_rh)) { 2656 goto noredhdropt; 2657 } 2658 2659 /* 2660 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2661 * about padding/truncate rule for the original IP packet. 2662 * From the discussion on IPv6imp in Feb 1999, 2663 * the consensus was: 2664 * - "attach as much as possible" is the goal 2665 * - pad if not aligned (original size can be guessed by 2666 * original ip6 header) 2667 * Following code adds the padding if it is simple enough, 2668 * and truncates if not. 2669 */ 2670 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2671 /* not enough room, truncate */ 2672 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2673 m0->m_pkthdr.len); 2674 } else { 2675 /* 2676 * enough room, truncate if not aligned. 2677 * we don't pad here for simplicity. 2678 */ 2679 int extra; 2680 2681 extra = m0->m_pkthdr.len % 8; 2682 if (extra) { 2683 /* truncate */ 2684 m_adj(m0, -extra); 2685 } 2686 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2687 } 2688 2689 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2690 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2691 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2692 nd_opt_rh->nd_opt_rh_len = len >> 3; 2693 p += sizeof(*nd_opt_rh); 2694 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2695 2696 /* connect m0 to m */ 2697 m->m_pkthdr.len += m0->m_pkthdr.len; 2698 m_cat(m, m0); 2699 m0 = NULL; 2700 } 2701 noredhdropt: 2702 m_freem(m0); 2703 m0 = NULL; 2704 2705 /* XXX: clear embedded link IDs in the inner header */ 2706 in6_clearscope(&sip6->ip6_src); 2707 in6_clearscope(&sip6->ip6_dst); 2708 in6_clearscope(&nd_rd->nd_rd_target); 2709 in6_clearscope(&nd_rd->nd_rd_dst); 2710 2711 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2712 2713 nd_rd->nd_rd_cksum = 0; 2714 nd_rd->nd_rd_cksum = 2715 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2716 2717 /* send the packet to outside... */ 2718 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2719 icmp6_ifstat_inc(ifp, ifs6_out_error); 2720 2721 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2722 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2723 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2724 2725 return; 2726 2727 fail: 2728 m_freem(m); 2729 m_freem(m0); 2730 } 2731 2732 /* 2733 * ICMPv6 socket option processing. 2734 */ 2735 int 2736 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2737 { 2738 int error = 0; 2739 struct inpcb *inp = sotoinpcb(so); 2740 2741 if (sopt->sopt_level != IPPROTO_ICMPV6) 2742 return rip6_ctloutput(op, so, sopt); 2743 2744 switch (op) { 2745 case PRCO_SETOPT: 2746 switch (sopt->sopt_name) { 2747 case ICMP6_FILTER: 2748 { 2749 struct icmp6_filter fil; 2750 2751 error = sockopt_get(sopt, &fil, sizeof(fil)); 2752 if (error) 2753 break; 2754 memcpy(in6p_icmp6filt(inp), &fil, 2755 sizeof(struct icmp6_filter)); 2756 error = 0; 2757 break; 2758 } 2759 2760 default: 2761 error = ENOPROTOOPT; 2762 break; 2763 } 2764 break; 2765 2766 case PRCO_GETOPT: 2767 switch (sopt->sopt_name) { 2768 case ICMP6_FILTER: 2769 { 2770 if (in6p_icmp6filt(inp) == NULL) { 2771 error = EINVAL; 2772 break; 2773 } 2774 error = sockopt_set(sopt, in6p_icmp6filt(inp), 2775 sizeof(struct icmp6_filter)); 2776 break; 2777 } 2778 2779 default: 2780 error = ENOPROTOOPT; 2781 break; 2782 } 2783 break; 2784 } 2785 2786 return error; 2787 } 2788 2789 /* 2790 * Perform rate limit check. 2791 * Returns 0 if it is okay to send the icmp6 packet. 2792 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2793 * limitation. 2794 * 2795 * XXX per-destination/type check necessary? 2796 */ 2797 static int 2798 icmp6_ratelimit( 2799 const struct in6_addr *dst, /* not used at this moment */ 2800 const int type, /* not used at this moment */ 2801 const int code) /* not used at this moment */ 2802 { 2803 int ret; 2804 2805 ret = 0; /* okay to send */ 2806 2807 /* PPS limit */ 2808 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2809 icmp6errppslim)) { 2810 /* The packet is subject to rate limit */ 2811 ret++; 2812 } 2813 2814 return ret; 2815 } 2816 2817 static struct rtentry * 2818 icmp6_mtudisc_clone(struct sockaddr *dst) 2819 { 2820 struct rtentry *rt; 2821 int error; 2822 2823 rt = rtalloc1(dst, 1); 2824 if (rt == NULL) 2825 return NULL; 2826 2827 /* If we didn't get a host route, allocate one */ 2828 if ((rt->rt_flags & RTF_HOST) == 0) { 2829 struct rtentry *nrt; 2830 2831 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2832 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2833 if (error) { 2834 rt_unref(rt); 2835 return NULL; 2836 } 2837 nrt->rt_rmx = rt->rt_rmx; 2838 rt_newmsg_dynamic(RTM_ADD, nrt); 2839 rt_unref(rt); 2840 rt = nrt; 2841 } 2842 2843 mutex_enter(&icmp6_mtx); 2844 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2845 icmp6_mtudisc_timeout_q); 2846 mutex_exit(&icmp6_mtx); 2847 2848 if (error) { 2849 rt_unref(rt); 2850 return NULL; 2851 } 2852 2853 return rt; /* caller need to call rtfree() */ 2854 } 2855 2856 static void 2857 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2858 { 2859 struct rtentry *retrt; 2860 2861 KASSERT(rt != NULL); 2862 rt_assert_referenced(rt); 2863 2864 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2865 (RTF_DYNAMIC | RTF_HOST)) { 2866 rtrequest(RTM_DELETE, rt_getkey(rt), 2867 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2868 rt_newmsg_dynamic(RTM_DELETE, retrt); 2869 rt_unref(rt); 2870 rt_free(retrt); 2871 } else { 2872 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2873 rt->rt_rmx.rmx_mtu = 0; 2874 } 2875 } 2876 2877 static void 2878 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2879 { 2880 struct rtentry *retrt; 2881 2882 KASSERT(rt != NULL); 2883 rt_assert_referenced(rt); 2884 2885 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2886 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2887 rtrequest(RTM_DELETE, rt_getkey(rt), 2888 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2889 rt_newmsg_dynamic(RTM_DELETE, retrt); 2890 rt_unref(rt); 2891 rt_free(retrt); 2892 } 2893 } 2894 2895 static int 2896 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2897 { 2898 2899 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2900 } 2901 2902 static int 2903 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2904 { 2905 int error, tmp; 2906 struct sysctlnode node; 2907 2908 mutex_enter(&icmp6_mtx); 2909 2910 node = *rnode; 2911 node.sysctl_data = &tmp; 2912 tmp = icmp6_redirtimeout; 2913 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2914 if (error || newp == NULL) 2915 goto out; 2916 if (tmp < 0) { 2917 error = EINVAL; 2918 goto out; 2919 } 2920 icmp6_redirtimeout = tmp; 2921 2922 if (icmp6_redirect_timeout_q != NULL) { 2923 if (icmp6_redirtimeout == 0) { 2924 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2925 } else { 2926 rt_timer_queue_change(icmp6_redirect_timeout_q, 2927 icmp6_redirtimeout); 2928 } 2929 } else if (icmp6_redirtimeout > 0) { 2930 icmp6_redirect_timeout_q = 2931 rt_timer_queue_create(icmp6_redirtimeout); 2932 } 2933 error = 0; 2934 out: 2935 mutex_exit(&icmp6_mtx); 2936 return error; 2937 } 2938 2939 static void 2940 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2941 { 2942 2943 sysctl_createv(clog, 0, NULL, NULL, 2944 CTLFLAG_PERMANENT, 2945 CTLTYPE_NODE, "inet6", NULL, 2946 NULL, 0, NULL, 0, 2947 CTL_NET, PF_INET6, CTL_EOL); 2948 sysctl_createv(clog, 0, NULL, NULL, 2949 CTLFLAG_PERMANENT, 2950 CTLTYPE_NODE, "icmp6", 2951 SYSCTL_DESCR("ICMPv6 related settings"), 2952 NULL, 0, NULL, 0, 2953 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2954 2955 sysctl_createv(clog, 0, NULL, NULL, 2956 CTLFLAG_PERMANENT, 2957 CTLTYPE_STRUCT, "stats", 2958 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2959 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2960 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2961 ICMPV6CTL_STATS, CTL_EOL); 2962 sysctl_createv(clog, 0, NULL, NULL, 2963 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2964 CTLTYPE_INT, "rediraccept", 2965 SYSCTL_DESCR("Accept and process redirect messages"), 2966 NULL, 0, &icmp6_rediraccept, 0, 2967 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2968 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2969 sysctl_createv(clog, 0, NULL, NULL, 2970 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2971 CTLTYPE_INT, "redirtimeout", 2972 SYSCTL_DESCR("Redirect generated route lifetime"), 2973 sysctl_net_inet6_icmp6_redirtimeout, 0, 2974 &icmp6_redirtimeout, 0, 2975 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2976 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2977 #if 0 /* obsoleted */ 2978 sysctl_createv(clog, 0, NULL, NULL, 2979 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2980 CTLTYPE_INT, "errratelimit", NULL, 2981 NULL, 0, &icmp6_errratelimit, 0, 2982 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2983 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2984 #endif 2985 sysctl_createv(clog, 0, NULL, NULL, 2986 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2987 CTLTYPE_INT, "nd6_prune", 2988 SYSCTL_DESCR("Neighbor discovery prune interval"), 2989 NULL, 0, &nd6_prune, 0, 2990 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2991 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2992 sysctl_createv(clog, 0, NULL, NULL, 2993 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2994 CTLTYPE_INT, "nd6_delay", 2995 SYSCTL_DESCR("First probe delay time"), 2996 NULL, 0, &nd6_nd_domain.nd_delay, 0, 2997 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2998 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2999 sysctl_createv(clog, 0, NULL, NULL, 3000 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3001 CTLTYPE_INT, "nd6_mmaxtries", 3002 SYSCTL_DESCR("Number of multicast discovery attempts"), 3003 NULL, 0, &nd6_nd_domain.nd_mmaxtries, 0, 3004 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3005 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3006 sysctl_createv(clog, 0, NULL, NULL, 3007 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3008 CTLTYPE_INT, "nd6_umaxtries", 3009 SYSCTL_DESCR("Number of unicast discovery attempts"), 3010 NULL, 0, &nd6_nd_domain.nd_umaxtries, 0, 3011 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3012 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 3013 sysctl_createv(clog, 0, NULL, NULL, 3014 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3015 CTLTYPE_INT, "nd6_maxnudhint", 3016 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3017 NULL, 0, &nd6_nd_domain.nd_maxnudhint, 0, 3018 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3019 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3020 sysctl_createv(clog, 0, NULL, NULL, 3021 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3022 CTLTYPE_INT, "maxqueuelen", 3023 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3024 NULL, 1, &nd6_nd_domain.nd_maxqueuelen, 0, 3025 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3026 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3027 sysctl_createv(clog, 0, NULL, NULL, 3028 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3029 CTLTYPE_INT, "nd6_useloopback", 3030 SYSCTL_DESCR("Use loopback interface for local traffic"), 3031 NULL, 0, &nd6_useloopback, 0, 3032 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3033 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3034 #if 0 /* obsoleted */ 3035 sysctl_createv(clog, 0, NULL, NULL, 3036 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3037 CTLTYPE_INT, "nd6_proxyall", NULL, 3038 NULL, 0, &nd6_proxyall, 0, 3039 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3040 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3041 #endif 3042 sysctl_createv(clog, 0, NULL, NULL, 3043 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3044 CTLTYPE_INT, "nodeinfo", 3045 SYSCTL_DESCR("Respond to node information requests"), 3046 NULL, 0, &icmp6_nodeinfo, 0, 3047 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3048 ICMPV6CTL_NODEINFO, CTL_EOL); 3049 sysctl_createv(clog, 0, NULL, NULL, 3050 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3051 CTLTYPE_INT, "errppslimit", 3052 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3053 NULL, 0, &icmp6errppslim, 0, 3054 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3055 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3056 sysctl_createv(clog, 0, NULL, NULL, 3057 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3058 CTLTYPE_INT, "mtudisc_hiwat", 3059 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3060 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3061 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3062 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3063 sysctl_createv(clog, 0, NULL, NULL, 3064 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3065 CTLTYPE_INT, "mtudisc_lowat", 3066 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3067 NULL, 0, &icmp6_mtudisc_lowat, 0, 3068 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3069 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3070 sysctl_createv(clog, 0, NULL, NULL, 3071 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3072 CTLTYPE_INT, "nd6_debug", 3073 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3074 NULL, 0, &nd6_debug, 0, 3075 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3076 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3077 sysctl_createv(clog, 0, NULL, NULL, 3078 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3079 CTLTYPE_BOOL, "reflect_pmtu", 3080 SYSCTL_DESCR("Use path MTU Discovery for icmpv6 reflect"), 3081 NULL, 0, &icmp6_reflect_pmtu, 0, 3082 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3083 ICMPV6CTL_REFLECT_PMTU, CTL_EOL); 3084 sysctl_createv(clog, 0, NULL, NULL, 3085 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3086 CTLTYPE_BOOL, "dynamic_rt_msg", 3087 SYSCTL_DESCR("Send routing message for RTF_DYNAMIC"), 3088 NULL, 0, &icmp6_dynamic_rt_msg, 0, 3089 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3090 ICMPV6CTL_DYNAMIC_RT_MSG, CTL_EOL); 3091 } 3092 3093 void 3094 icmp6_statinc(u_int stat) 3095 { 3096 3097 KASSERT(stat < ICMP6_NSTATS); 3098 ICMP6_STATINC(stat); 3099 } 3100
Indexes created Sat Sep 20 22:09:52 GMT 2025